tert-butyl (2S,3'S)-2-(3'-acetoxy-N-tert-butoxycarbonyl-3'-tert-butoxycarbonylpropylamino)-4-(2,2,2-trichloroethoxycarbonyloxy)butanoate

(3S,3'S)-3-[N-tert-butoxycarbonyl-3'-hydroxy-3'-(4-methoxyphenyl)propylamino]-3-(4-methoxyphenyl)-1-(2,2,2-trichloroethoxycarbonyloxy)propane

(3S,3'S)-3-(3'-acetoxy-N-tert-butoxycarbonyl-3'-(4-methoxyphenyl)propylamino)-3-(4-methoxyphenyl)-1-(2,2,2-trichloroethoxycarbonyloxy)propane

(3S,3'S)-3-(N-tert-butoxycarbonyl-3'-tert-butyldimethylsiloxy-3'-(4-methoxyphenyl)-propylamino)-3-(4-methoxyphenyl)-1-(2,2,2-trichloroethoxycarbonyloxy)propane

(S)-1-{(S)-3-tert-Butoxycarbonyl-3-[(S)-3-tert-butoxycarbonyl-3-(tert-butyl-dimethyl-silanyloxy)-propylamino]-propyl}-azetidine-2-carboxylic acid tert-butyl ester